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Is the cardiac output obtained from a Swan–Ganz catheter always zero?

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Abstract

Objective

By means of a Swan–Ganz catheter cardiac output is calculated using the Stewart–Hamilton thermodilution equation. Assuming the body as a thermally isolated inert system, this equation theoretically always results in zero cardiac output.

Methods

Using the first and second law of thermodynamics together with a few lines simple analysis this statement is proven.

Conclusion

It is at least a necessary condition for the application of the Stewart–Hamilton equation, that core body temperature is kept constant in a thermo- regulatory steady state.

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Authors and Affiliations

  1. Division of General Anesthesia and Intensive Care, Medical University of Vienna, Waehringer Guertel 18-20/9 i, 1090, Vienna, Austria

    Wolfgang Schramm MD

Authors
  1. Wolfgang Schramm MD
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Corresponding author

Correspondence to Wolfgang Schramm MD.

Additional information

Schramm W. Is the cardiac output obtained from a Swan–Ganz catheter always zero?

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Schramm, W. Is the cardiac output obtained from a Swan–Ganz catheter always zero?. J Clin Monit Comput 22, 431–433 (2008). https://doi.org/10.1007/s10877-008-9149-5

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  • DOI: https://doi.org/10.1007/s10877-008-9149-5

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